Accession Number : AD0750634

Title :   Investigation of the Dissipation of the Tip Vortex of a Rotor Blade by Mass Injection.

Descriptive Note : Final rept.,

Corporate Author : ROCHESTER APPLIED SCIENCE ASSOCIATES INC N Y

Personal Author(s) : White,Richard P. , Jr. ; Balcerak,John C.

Report Date : AUG 1972

Pagination or Media Count : 96

Abstract : The report describes an experimental research program in which the outer section of a UH-1D helicopter blade was modified to incorporate a system for injecting the tip vortex produced by the blade with a mass of linearly directed air. The effects of nozzle geometry, the velocity of injection, the turbulence wavelength, and the angle of injection on the resulting strength of the trailed tip vortex were investigated, and the results are presented in terms of quantitative measurements of the circulation strength as a function of the injected mass of air. (Author)

Descriptors :   (*ROTOR BLADES(ROTARY WINGS), VORTICES), AERODYNAMIC SLOTS, SPOILERS, ANGLE OF ATTACK, FLOW FIELDS, INJECTION, FLOW VISUALIZATION, WIND TUNNEL MODELS

Subject Categories : Aircraft
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE